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Validating the MailChimp subscribe form with vanilla JavaScript

Over the last few articles in this series, we’ve learned how to use a handful of input types and validation attributes to natively validate forms.

We’ve learned how to use the Constraint Validation API to enhance the native browser validation process for a better overall user experience. And we wrote a polyfill to extend support all the way back to IE9 (and plug a few feature holes in some newer versions).

In my final post on CSS Tricks, let’s take what we’ve learned and apply it to a real example: the MailChimp signup form.